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Stock-based Compensation Plans - Allocation of Stock-Based Compensation by Functional Category (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |
Stock-based compensation expense | $ 9,222 | $ 10,164
Direct Operating Expense |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |
Stock-based compensation expense | 450 | 591
Brokered Natural Gas and Marketing Expense |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |
Stock-based compensation expense | 413 | 385
Exploration Expense |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |
Stock-based compensation expense | 330 | 373
General and Administrative Expense |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |
Stock-based compensation expense | $ 8,029 | $ 8,815

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